Refinance Calculator
A comprehensive, transparent loan and mortgage refinance calculator. Compare side-by-side payments, evaluate closing costs and discount points, simulate rolling fees into your loan or cash-out, and track your break-even trajectory with interactive charts and amortization schedules.
Refinance Trajectory & Amortization Schedule
Current: $2,025.62/ mo (6.5%)·New: $1,797.74/ mo (5.25%)·Net Lifetime: $62,364.00★ Break-Even: 27 months (2.25 years)
Cumulative Savings Trajectory
Shows cumulative cash saved over time. The zero-crossing point represents your break-even month.
Amortization Table
| Period | Date | Payment | Principal | Interest | Total Interest | Ending Balance |
|---|---|---|---|---|---|---|
| Year 1 | 2027 | $21,572.88 | $5,965.07 | $15,607.81 | $15,607.81 | $294,034.93 |
| Year 2 | 2028 | $21,572.88 | $6,285.86 | $15,287.02 | $30,894.83 | $287,749.07 |
| Year 3 | 2029 | $21,572.88 | $6,623.94 | $14,948.94 | $45,843.77 | $281,125.13 |
| Year 4 | 2030 | $21,572.88 | $6,980.19 | $14,592.69 | $60,436.46 | $274,144.94 |
| Year 5 | 2031 | $21,572.88 | $7,355.59 | $14,217.29 | $74,653.75 | $266,789.35 |
How Mortgage Refinancing Is Calculated: Formulas & Savings Models
Understand the transparent mathematics behind loan refinancing: from amortized monthly payment reductions and upfront closing costs to your exact break-even point and cumulative lifetime interest savings.
1. Monthly Payment Savings
Calculates the immediate cash flow difference between your current loan's monthly payment and the new refinanced monthly payment based on standard annuity amortization.
2. Refinance Costs & New Loan Amount
Computes total upfront closing fees and the final refinanced loan balance if closing costs are rolled into the loan or additional home equity cash is taken out.
3. Break-Even Payback Period
Determines the exact number of months required for cumulative monthly payment savings to fully recover all upfront closing fees and discount points.
4. Net Lifetime Financial Savings
Evaluates the true long-term financial benefit by comparing all remaining payments under the old loan against all payments and fees of the new loan.
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Frequently Asked Questions (FAQ)
QHow is mortgage refinancing calculated?
Mortgage refinancing is calculated by comparing your current monthly payment against the new loan installment (computed via the amortization annuity formula M = P * [r(1+r)^n] / [(1+r)^n - 1]), factoring in closing costs, discount points, and cash-out equity. Monthly savings equal your current payment minus the new payment. The break-even period is determined by dividing total upfront refinance costs by net monthly savings, while net lifetime savings subtract total new payments and fees from remaining old loan payments.
QWhat is the break-even point in refinancing and how is it calculated?
The break-even point is the exact timeframe required for your accumulated monthly payment savings to exceed the total upfront costs of the new loan. It is calculated by dividing your Total Refinance Costs (closing fees plus discount points) by your Net Monthly Payment Savings. For example, if refinancing costs $3,600 and saves $150 per month, your break-even point is 24 months (2.0 years). If you sell or refinance again before month 24, you lose money.
QShould I pay refinance closing costs upfront out-of-pocket or roll them into the new loan?
Paying upfront minimizes your new loan balance, eliminates interest charges on the transaction fees, and maximizes lifetime savings. Rolling closing costs into the loan balance avoids out-of-pocket expenses at closing, but increases your new principal, which slightly raises your monthly payment and leads to paying compounded interest on those fees over the entire loan lifespan.
QWhat are mortgage discount points and when is it beneficial to purchase them?
One discount point costs 1% of your total loan amount and generally lowers your interest rate by approximately 0.25%. Purchasing points is financially advantageous if you have surplus upfront cash and intend to keep the loan long past the extended break-even milestone needed to recoup the point's upfront fee. If you plan to move or refinance in a few years, buying points is not recommended.
QWhat is a cash-out refinance and how does it affect monthly payments and equity?
A cash-out refinance replaces your existing mortgage with a new, larger loan balance, allowing you to withdraw a portion of your accrued home equity as a lump sum. While it provides funding for high-interest debt consolidation or home improvements at lower mortgage interest rates, it reduces your home equity, increases total principal, and resets amortization, resulting in higher monthly payments or an extended payoff timeline.
QHow does shortening or extending the loan term during a refinance affect total interest?
Refinancing from a 30-year to a 15-year mortgage significantly increases your monthly payment but drastically slashes the total interest paid over the life of the loan due to accelerated principal reduction. Conversely, resetting a remaining 20-year term back to a new 30-year term lowers your immediate monthly burden but can result in paying substantially more cumulative interest over time.
Financial & Regulatory Disclaimer
Generated by enetko for informational purposes only. Figures are based on the values entered and do not constitute financial, tax, or legal advice.